But now MPs can table amendments to the legislation, and more than 100 tweaks have been put forward, with both Brexiteers and former Remainers today laying out the key battlegrounds for the next few days.

Asked whether the government was committed to passing the bill unamended, a Downing Street spokeswoman said today: "We've been very clear - we think that this should be a straightforward bill about giving the government the power to deliver on the decision of the British people."